identify access points to model mutations

[ichthyo]

Question is how exactly to relate the discovery API to the possibility of performing mutations on the model. It is clear that those mutations will go through the command frontend (and from there to the proc dispatcher)

• identify the preferable points where to invoke those commands
• consider ways how to link in the arguments automatically from the given context
• investigate if hard-wiring is acceptable -- or do we need some kind of binding?